javascript - 如果值来自 if/then 语句，则从数组中删除元素 - Javascript

Question

我正在遍历数组中的元素。如果某个值不在特定范围内，我想删除该元素(与该值相关联)。

这是我目前所拥有的(见下面的代码)——我正在使用 pop 方法删除元素，但数组中的最后一个元素总是被删除，而不是 if/then 中的元素/值陈述。我也试过 splice 方法，但我无法让它工作。关于如何执行此操作的任何想法？

    var h = [
    	["29","Verbena St", "500", "2", "2,702"],
    	["36", "Quitman St", "400", "2", "1,700"],
    	["32", "Alan Dr", "500", "2", "2,408"],
    	["34", "Newton St", "300", "2", "1,954"],
    	["30", "Soth Pl", "400", "2", "1,509"]
    ];

    var hs = [
     	["Verbena St"],
    	["Quitman St"],
        ["Alan Dr"],
     	["Newton St"],
     	["Soth Pl"]
    ];


function Location (){

    for (var r = 0; r <= h.length; r++){
        var p = h[r][0];
	    var address = h[r][1]; // Get address
        if (p >= 21 && p <= 33 && address == hs[r]){
            console.log(address);
        }
        else {
            console.log(address + " - OVER 33");
            h.pop(address);
            console.log(address + " - REMOVED");
        }
   }
};

Location();

Answer 1

在遍历数组时从数组中删除元素不是好习惯，相反，您可以使用 filter() 过滤它，如下所示:

var h = [
  ["29","Verbena St", "500", "2", "2,702"],
  ["36", "Quitman St", "400", "2", "1,700"],
  ["32", "Alan Dr", "500", "2", "2,408"],
  ["34", "Newton St", "300", "2", "1,954"],
  ["30", "Soth Pl", "400", "2", "1,509"]
];

var hs = [
  ["Verbena St"],
  ["Quitman St"],
  ["Alan Dr"],
  ["Newton St"],
  ["Soth Pl"]
];

function Location (){
  h = h.filter(function(r, i){ // r = value, i = index
    var p=r[0];
    var address = r[1]; // Get address
    return p >= 21 && p <= 33 && address == hs[i];
  });
};

Location();
console.log(h);

或者，如果你想显示消息，你可以使用另一个数组并只将你想要的元素推送到它(最好使用 forEach):

var h = [
  ["29","Verbena St", "500", "2", "2,702"],
  ["36", "Quitman St", "400", "2", "1,700"],
  ["32", "Alan Dr", "500", "2", "2,408"],
  ["34", "Newton St", "300", "2", "1,954"],
  ["30", "Soth Pl", "400", "2", "1,509"]
];

var hs = [
  ["Verbena St"],
  ["Quitman St"],
  ["Alan Dr"],
  ["Newton St"],
  ["Soth Pl"]
];

function Location (){
  var g = [];
  h.forEach(function(r, i){ // r = value, i = index
    var p = r[0];
    var address = r[1]; // Get address
    if (p >= 21 && p <= 33 && address == hs[i]){
    	console.log(address);
      g.push(r); // push it
    }
    else{
      console.log(address + " - OVER 33 - REMOVED"); // do nothing
    }
  });
  h = g;
}

Location();
console.log(h);